Literary usage of Glycins

Below you will find example usage of this term as found in modern and/or classical literature:

1.Poetica Erotica: A Collection of Rare and Curious Amatory Verse by Thomas Robert Smith (1921)"That is why I no longer salute you in passing before your glycins and your
rhododendrons. Pardon me, smile of Lesbos ! Scandalize as much as it pleases you, ..."

2.The Poetical Works of Coleridge, Shelley, and Keats: Complete in One Volume by Samuel Taylor Coleridge, Percy Bysshe Shelley, John Keats (1829)"Say on ! GLYCINE. The false ones charged the valiant youth With treasonous words
of Emerick— ZAPOLYA. And of Lord Casimir— glycins. ..."